Penetration color screen, color tube, and color television receiver



Aug. 31, 1965 D. H. PRlTcHARD 3,204,143

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24. A SINGLE-GUN CATHODE RAY TUBE HAVING A COLOR SCREEN DESIGNED TO A OPERATED BY PENETRATION OF ELECTRON BEAMS OF THREE DIFFERENT VOLTAGE RANGES AND WHERE THE BEAMS ARE TO BE MODULATED BY A COLOR TELEVISION SIGNAL THAT INCLUDES A COLOR SUBCARRIER, MEANS INCLUDING SAID GUN FOR PRODUICING SUCCESSIVELY AN ELECTRON BEAM OF CERTAIN LOWEST VOLTAGE RANGE, AN ELECTRON BEAM OF A HIGHER MIDDLE VOLTAGE RANGE, AND AN ELECTRON BEAM OF A HIGHEST VOLTAGE RANGE, MEANS FOR PRODUCING SAID THREE DIFFERENT VOLTAGE RANGE BEAMS DURING ONE PRODUCING SAID THREE DIFFERENT VOLTAGE A PREDETERMINED PHASE RELATION THERETO, SAID SCREEN COMPRISING A MULTITUDE OF FRACTION AREAS EACH COMPRISING A BACK OR GUNSIDE PHOSPHOR LAYER THAT EMITS LIGHT OF A CERTAIN COLOR WHEN EXCITED BY ELECTRONS, A MIDDLE PHOSPHOR LAYER THAT EMITS LIGHT OF A DIFFERENT COLOR WHEN EXCITED BY ELECTRONS, AND A BASE PHOSPHOR LAYER THAT EMITS LIGHT OF A STILL DIFFERENT COLOUR WHEN EXCITED BY ELECTRONS, LAYERS OF INERT MATERIAL BETWEEN SAID PHOSPHOR LAYERS AND SAID BASE PHOSPHOR, SAID LAYERS HAVING A MASS THICKNESS SUCH THAT WHEN PENETRATED BY SAID ELECTRON BEAM OF HIGHEST VOLTAGE RANGE THE BASE PHOSPHOR IS PENETRATED BY SAID ELECTRON BEAM BUT WITH LESS OF THE ELECTRON ENERGY ABSORBED IN IT THAN IN THE SCREEN BETWEEN SAID BASE PHOSPHOR AND THE GUN-SIDE SURFACE OF SAID SCREEN, THE SCREEN LAYERS BETWEEN THE MIDDLE PHOSPHOR LAYER AND THE GUN-SIDE SURFACE OF THE SCREEN HAVING A MASS THICKNESS SUCH THAT THE MIDDLE PHOSPHOR LAYER IS PENETRATED BY SAID ELECTRON BEAM OF MIDDLE VOLTAGE RANGE BUT WITH LESS ELECTRON ENERGY ABSORBED IN IT THAN IN THE LAYER BETWEEN THE MIDDLE PHOSPHOR LAYER AND THE GUN-SIDE SURFACE OF THE SCREEN, AND THE SCREEN LAYERS BETWEEN THE MIDDLE PHOSPHOR LAYER AND THE GUN-SIDE SURFACE OF THE SCREEN ALSO HAVING A MASS THICKNESS SUCH THAT NO MORE THAN A SMALL PART OF THE ENERGY OF SAID ELECTRON BEAM OFF LOWEST VOLTAGE RANGE IS ABSORBED IN THE MIDDLE PHOSPHOR LAYER, THE CONVERSION EFFICIENCY OF THE BASE PHOSPHOR AND OF THE MIDDLE PHOSPHOR LAYER BOTH BEING ENOUGH GREATER THAN THE EFFECTIVE CONVERSION EFFICIENCY OF THE GUN-SIDE PHOSPHOR LAYER SO THAT WHEN THERE IS SCREEN PENETRATION ONLY BY SAID ELECTRON BEAM OF HIGHEST VOLTAGE RANGE THERE IS PRODUCED A COLOR THAT SUBJECTIVELY IS SAID STILL DIFFERENT COLOR, AND SO THAT WHEN THERE IS SCREEN PENETRATION ONLY BY SAID ELECTRON BEAM OF THE MIDDLE VOLTAGE RANGE THERE IS PRODUCED A COLOR THAT SUBJECTIVELY IS SAID DIFFERENT COLOR, THE RELATIVE CONVERSION EFFICIENCIES OF SAID PHOSPHOR ALSO BEING SUCH THAT DURING THE CYCLE OF PRODUCING SUCCESSIVELY SAID ELECTRON BEAMS OF THE THREE DIFFERENT VOLTAGE RANGES THE THREE PHOSPHOR LAYERS EMIT LIGHT IN THE CORRECT RELATIVE PROPORTIONS TO GIVE A WHITE LIGHT MIX IN THE ABSENCE OF COLOR MODULATION OF SAID ELECTRON BEAMS. 